Itineraries flown on 20+ days in the Jun 6 – Jul 31, 2026 schedule · each leg’s record Aug 2025 – Jul 2026

No clear winner: airlines and hours on this route all land within a few points of 88% on time.

Nonstops


Alaska	BOI	SMF	1h 34m	94%	0.8%	365	Flying now
Southwest	BOI	SMF	1h 30m	86%	0.1%	860	Flying now

Best connections, one ticket

Most reliable Quickest (80%+ on time)

Ranked by chance you reach Sacramento on time. Total trip = scheduled departure to arrival, layover included (Sacramento is 1 h behind Boise). Layovers up to 4 hours. Pick a connection for the details.


Southwest Details →	BOI 05:18 → PHX 06:22WN 4470	1h 23m Phoenix	PHX 07:45 → SMF 09:45WN 2885	5h 25m	100%	94%
Alaska Details →	BOI 05:57 → PDX 06:17AS 1566	1h 58m Portland	PDX 08:15 → SMF 09:48AS 485	4h 51m	100%	92%
Southwest Details →	BOI 06:00 → LAS 06:45WN 701	1h 50m Las Vegas	LAS 08:35 → SMF 10:05WN 860	5h 05m	100%	92%
Delta Details →	BOI 06:43 → SEA 07:35DL 3775 · flown by SkyWest	2h 35m Seattle	SEA 10:10 → SMF 12:18DL 4125 · flown by SkyWest	6h 35m	100%	91%
Delta Details →	BOI 07:00 → LAX 08:28DL 3725 · flown by SkyWest	3h 37m Los Angeles	LAX 12:05 → SMF 13:32DL 3812 · flown by SkyWest	7h 33m	99%	88%
Delta Details →	BOI 05:30 → MSP 09:15DL 2808	1h 08m Minneapolis	MSP 10:23 → SMF 12:11DL 1701	7h 41m	93%	87%
Delta Details →	BOI 11:55 → SEA 12:42DL 3678 · flown by SkyWest	2h 03m Seattle	SEA 14:45 → SMF 16:47DL 4153 · flown by SkyWest	5h 52m	98%	87%
Delta Details →	BOI 18:42 → SLC 19:57DL 2920	3h 07m Salt Lake City	SLC 23:04 → SMF 23:44DL 1582	6h 06m	99%	86%
Tight connection: often missed
Delta Details →	BOI 15:29 → SEA 16:11DL 3958 · flown by SkyWest	49m Seattle	SEA 17:00 → SMF 19:01DL 4043 · flown by SkyWest	4h 32m	72%	64%
United Details →	BOI 17:46 → DEN 19:45UA 2395	55m Denver	DEN 20:40 → SMF 22:15UA 1268	5h 29m	41%	24%
Southwest Details →	BOI 16:25 → DEN 18:20WN 700	1h 05m Denver	DEN 19:25 → SMF 20:55WN 136	5h 30m	46%	4%

Same layover, different day-part

How often the first flight arrives too late to connect (45 min minimum), for one-ticket layovers of 45–80 minutes.

Morning

DEN · 1h 10m · leaves 07:20 2%

SEA · 1h 12m · leaves 06:43 2%

MSP · 1h 08m · leaves 05:30 7%

Afternoon and evening

PDX · 1h 14m · leaves 16:23 8%

SEA · 49m · leaves 15:29 28%

DEN · 55m · leaves 17:46 59%

Delays build through the day, so an afternoon first leg eats the layover. A short connection is fine early in the morning and a gamble later on.

Mixing airlines

One ticketMiss it and the airline rebooks you; bags go through. 45 min is enough.

Separate ticketsMiss it and you buy a new ticket. Re-check bags, clear security again: we require 90 min.


Alaska AS 423 BOI 06:23 → SEA Delta DL 3881 SEA 08:47 → SMF Connection details →	1h 47m	5h 27m	100%	92%
Alaska AS 740 BOI 16:27 → SEA Delta DL 4131 SEA 20:25 → SMF Connection details →	3h 19m	7h 01m	98%	89%
Alaska AS 2235 BOI 13:06 → SEA Delta DL 4043 SEA 17:00 → SMF Connection details →	3h 20m	6h 55m	100%	88%

Rank all connections, any airlines →

Regional partners count as the airline that sells them: SkyWest flying Delta Connection is one Delta ticket.

How these are worked out. Makes the connection: share of the last year’s flights where the first flight arrived with at least 45 minutes to spare (90 on separate tickets). Arrives on time: first flight not cancelled × connection made × second flight not cancelled and arriving within 15 minutes. Not yet counted: the second flight also leaving late (which helps), gate-to-gate distance at the hub, and rebooking after a missed connection.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON